Differences Between Dry Type and Oil Filled Transformers

Transformers are essential components in the electrical distribution system, responsible for stepping up or stepping Down voltage Levels to ensure efficient Power Transmission. There are two main types of transformers commonly used in the industry: dry type transformers and oil-filled transformers. Each type has its own set of advantages and disadvantages, making them suitable for different applications.

Dry type transformers, as the name suggests, do not use any liquid coolant for insulation. Instead, they rely on air or solid insulation materials to prevent electrical arcing and provide dielectric strength. This makes them a safer option for indoor installations, as they do not pose the risk of oil leaks or fires. Dry type transformers are also more environmentally friendly, as they do not contain any hazardous substances that can leak into the Environment in case of a malfunction.

Type	Rating\\u00a0capacity\\u00a0\\uff08KVA\\uff09	Voltage\\u00a0combination\\uff08KV\\uff09	No-load\\u00a0losses\\uff08W\\uff09	Load\\u00a0losses\\uff08W\\uff09	No-load\\u00a0current\\u00a0\\uff08%\\uff09	Short-circuit\\u00a0voltage\\u00a0\\uff08%\\uff09
SC12-30	30	6,6.3,6.6,10,11/0.4	150	710	2.0	4.0
SC12-50	50	6,6.3,6.6,10,11/0.4	215	1000	2.0	4.0
SC12-80	80	6,6.3,6.6,10,11/0.4	295	1380	1.5	4.0
SC12-100	100	6,6.3,6.6,10,11/0.4	320	1570	1.5	4.0
SC12-125	125	6,6.3,6.6,10,11/0.4	375	1850	1.3	4.0
SCB12-160	160	6,6.3,6.6,10,11/0.4	430	2130	1.3	4.0
SCB12-200	200	6,6.3,6.6,10,11/0.4	495	2530	1.1	4.0
SCB12-250	250	6,6.3,6.6,10,11/0.4	575	2760	1.1	4.0
SCB12-315	315	6,6.3,6.6,10,11/0.4	705	3470	1.0	4.0
SCB12-400	400	6,6.3,6.6,10,11/0.4	785	3990	1.0	4.0
SCB12-500	500	6,6.3,6.6,10,11/0.4	930	4880	1.0	4.0
SCB12-630	630	6,6.3,6.6,10,11/0.4	1070	5880	0.85	4.0
SCB12-630	630	6,6.3,6.6,10,11/0.4	1040	5960	0.85	6.0
SCB12-800	800	6,6.3,6.6,10,11/0.4	1210	6960	0.85	6.0
SCB12-1000	1000	6,6.3,6.6,10,11/0.4	1410	8130	0.85	6.0
SCB12-1250	1250	6,6.3,6.6,10,11/0.4	1670	9690	0.85	6.0
SCB12-1600	1600	6,6.3,6.6,10,11/0.4	1960	11700	0.85	6.0
SCB12-2000	2000	6,6.3,6.6,10,11/0.4	2440	14400	0.7	6.0
SCB12-2500	2500	6,6.3,6.6,10,11/0.4	2880	17100	0.7	6.0

On the other hand, oil-filled transformers use mineral oil as a coolant and insulating medium. The oil helps to dissipate heat generated during operation, ensuring that the transformer operates within safe temperature limits. Oil-filled transformers are typically used in outdoor installations, such as pole-mounted transformers, where the risk of fire is lower. However, they require regular maintenance to check for oil leaks and ensure that the oil is clean and free of contaminants.

One of the main differences between dry type and oil-filled transformers is their cooling methods. Dry type transformers rely on natural convection or forced air cooling to dissipate heat, while oil-filled transformers use oil circulation systems or Radiators to remove heat from the transformer windings. This difference in cooling methods can affect the efficiency and reliability of the transformer, as inadequate cooling can Lead to overheating and premature failure.

Resin transformer 11 series	Rating\\u00a0capacity\\u00a0\\uff08KVA\\uff09	Voltage\\u00a0combination\\uff08KV\\uff09	Off-load\\u00a0losses\\uff08W\\uff09	Load\\u00a0losses\\uff08W\\uff09	Off-load\\u00a0current\\u00a0\\uff08%\\uff09	Short-circuit\\u00a0voltage\\u00a0\\uff08%\\uff09
SC11-30	30	6,6.3,6.6,10,11/0.4	180	710	2.4	4.0
SC11-50	50	6,6.3,6.6,10,11/0.4	250	1000	2.4	4.0
SC11-80	80	6,6.3,6.6,10,11/0.4	340	1380	1.8	4.0
SC11-100	100	6,6.3,6.6,10,11/0.4	360	1570	1.8	4.0
SC11-125	125	6,6.3,6.6,10,11/0.4	420	1850	1.6	4.0
SCB11-160	160	6,6.3,6.6,10,11/0.4	490	2130	1.6	4.0
SCB11-200	200	6,6.3,6.6,10,11/0.4	560	2530	1.4	4.0
SCB11-250	250	6,6.3,6.6,10,11/0.4	650	2760	1.4	4.0
SCB11-315	315	6,6.3,6.6,10,11/0.4	790	3470	1.2	4.0
SCB11-400	400	6,6.3,6.6,10,11/0.4	880	3990	1.2	4.0
SCB11-500	500	6,6.3,6.6,10,11/0.4	1050	4880	1.2	4.0
SCB11-630	630	6,6.3,6.6,10,11/0.4	1210	5880	1.0	4.0
SCB11-630	630	6,6.3,6.6,10,11/0.4	1170	5960	1.0	6.0
SCB11-800	800	6,6.3,6.6,10,11/0.4	1370	6960	1.0	6.0
SCB11-1000	1000	6,6.3,6.6,10,11/0.4	1590	8130	1.0	6.0
SCB11-1250	1250	6,6.3,6.6,10,11/0.4	1880	9690	1.0	6.0
SCB11-1600	1600	6,6.3,6.6,10,11/0.4	2210	11730	1.0	6.0
SCB11-2000	2000	6,6.3,6.6,10,11/0.4	2720	14450	0.8	6.0
SCB11-2500	2500	6,6.3,6.6,10,11/0.4	3200	17170	0.8	6.0

Another important factor to consider when choosing between dry type and oil-filled transformers is their cost. Dry type transformers are generally more expensive to purchase and install than oil-filled transformers, due to the higher cost of materials and manufacturing processes. However, they have lower maintenance costs in the long run, as they do not require regular oil testing and replacement. Oil-filled transformers, on the other hand, have lower upfront costs but higher maintenance costs, making them more suitable for applications where initial investment is a key consideration.

In terms of efficiency, both dry type and oil-filled transformers have similar performance characteristics. However, oil-filled transformers tend to have slightly higher losses due to the heat generated by the oil coolant. This can result in lower overall efficiency and higher operating costs over the lifetime of the transformer. Dry type transformers, on the other hand, have lower losses and higher efficiency, making them a more cost-effective option for applications where energy efficiency is a priority.

In conclusion, both dry type and oil-filled transformers have their own set of advantages and disadvantages, making them suitable for different applications. When choosing between the two types, it is important to consider factors such as installation location, maintenance requirements, cost, and efficiency. Ultimately, the best choice will depend on the specific needs and requirements of the electrical distribution system.